ISSN 2285-5785, ISSN CD-ROM 2285-5793, ISSN ONLINE 2285-5807, ISSN-L 2285-5785


Published in Scientific Papers. Series A. Agronomy, Vol. LIX
Written by Lucia MACRII

Information about soil properties changes under different anthropic-impact levels is necessary for selecting appropriate sustainable soil management practices. The aim of this work was to evaluate the plasticity and water-stable microaggregates content (<0.25 mm) of soil in various agroecosystems and to show the correlations established between them. These soil properties sensitize very well biochemical and physical soil changes and can be used as diagnostical indexes. The study was conducted on carbonate chernozem at the Didactic Station “Chetrosu” of the State Agrarian University of Moldova, including long-term crop rotation agroecosystems, single-crop systems (55 years) - fallow, alfalfa, weed-free fallow and single-maize-crop system (29 years). The researches has shown that, with anthropic-impact amplification, soil plasticity is decreasing and powder fraction (<0.25 mm) content is increasing. The best physic and physic-mechanical soil properties (water-stable microaggregates content (<0.25 mm), plasticity) were established at fallow (55 years) and the worst at weed-freefallow (55 years), the other studied agroecosystems takes an intermediate position between these two extremes. There were established strong and medium correlations between plasticity (liquid and plastic limits) and water-stable microaggregates content (<0.25 mm) of carbonate chernozem managed under different anthropic-impact levels. Correlation coefficients and trend lines between plasticity and the water-stable microaggregates content (<0.25 mm) revealed a negative tendency because the soil plasticity decrease at the same time with the powder fraction content increasing.

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